205270811 has 2 divisors, whose sum is σ = 205270812. Its totient is φ = 205270810.

The previous prime is 205270771. The next prime is 205270823. The reversal of 205270811 is 118072502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205270811 - 2¹⁸ = 205008667 is a prime.

It is a super-2 number, since 2×205270811² = 84272211697195442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205270841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102635405 + 102635406.

It is an arithmetic number, because the mean of its divisors is an integer number (102635406).

Almost surely, 2^205270811 is an apocalyptic number.

205270811 is a deficient number, since it is larger than the sum of its proper divisors (1).

205270811 is an equidigital number, since it uses as much as digits as its factorization.

205270811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 205270811 is about 14327.2750723925. The cubic root of 205270811 is about 589.8963822630.

The spelling of 205270811 in words is "two hundred five million, two hundred seventy thousand, eight hundred eleven".